Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Any real "cons" to swapping a TF350 for a TH700R4?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Zeus33rd, Mar 23, 2002.

  1. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

    Joined:
    Mar 14, 2002
    Posts:
    7,324
    Likes Received:
    9
    Location:
    Grass Valley, CA
    Any real \"cons\" to swapping a TF350 for a TH700R4?

    Havbe the TH350 now, but I really like the idea of the lower first gear and OD in the 700R4. Heard all the horror stories about the 700 and from what I hear, if ya get the later model, 89-91, then no worries. Of course there is always the TCI/Raptor route. I plan on stayin with the small block- Probably the 330HP GM crate sometime in the future, So I think the strength issues in the 700 won't be a problem. Wanted to here some opinions/input on the idea from people here. /forums/images/icons/laugh.gif

    Also what issues with adapting to a 203 case?
     
  2. xnoahx

    xnoahx 1/2 ton status

    Joined:
    Oct 12, 2000
    Posts:
    817
    Likes Received:
    0
    Location:
    Ventura, CA 93004
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    Im thinking of doing the same thing on my 73. The only thing that you need to do to the trans is get a shorter tail shaft if you get a trans from a 2wd. Its $170 from advance adapters. it would be another $200 to get it installed. Just get a big trans cooler. You will also have to move back your tansfer case crossmember and maybemodify your drive shafts(lengthen front, shorten rear) because the 700 is about 2" longer than the 350
     
  3. A&P

    A&P Registered Member

    Joined:
    Dec 3, 2001
    Posts:
    88
    Likes Received:
    0
    Location:
    San Antonio, Texas
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    Go for it. Just get a huge woppin' cooler for it. Heat is what destroys them. They're great transmissions.
    -Ben
     
  4. jimmyjack

    jimmyjack 1/2 ton status

    Joined:
    May 11, 2000
    Posts:
    2,290
    Likes Received:
    0
    Location:
    Tucson Az
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    It's a can of worms you've just opened up! I was looking into it a while back and was surprised to hear tranny guys tell me NOT to do it. From what they said 350's are not as common as they used to be so parts are getting to be more expensive, they're almost as much to rebuild as a 700r4, the 350 isnt geared the same as a 700, it'll run hotter, gotta get an adapter,blah blah blah. They all said they would help me get it together but I'd end up going back to a 700. I like my 700r4 alot, I had a good builder take care of me. He only charged me $450! Good luck either way you go!!!!
     
  5. RedDwarf

    RedDwarf 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    816
    Likes Received:
    0
    Location:
    North Central Florida
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    He's going the other way
     
  6. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

    Joined:
    Mar 14, 2002
    Posts:
    7,324
    Likes Received:
    9
    Location:
    Grass Valley, CA
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    Yeah....RedDwarf is correct. O have the 350 now, Was curious about the 700. /forums/images/icons/laugh.gif
     
  7. 90K5

    90K5 1/2 ton status

    Joined:
    Jun 1, 2000
    Posts:
    3,719
    Likes Received:
    0
    Location:
    Lubbock, TX
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    Chances are any trans you get if its used is gonna need some work. Remember the newest of these trannies is 11 years old, with lots of miles...I'd expect to shell out about $1000-$1500 for a good one
     
  8. jimmyjack

    jimmyjack 1/2 ton status

    Joined:
    May 11, 2000
    Posts:
    2,290
    Likes Received:
    0
    Location:
    Tucson Az
    Re: Any real \"cons\" to swapping a TF350 for a TH700R4?

    OOOOOOPS you're right!!
     

Share This Page